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Now that hasConstantValue has been made simpler, it may return the

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phi node itself if it occurs in an unreachable basic block.  Protect
against this.  Hopefully this will fix some more buildbots.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119493 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands 2010-11-17 10:23:23 +00:00
parent baa45f7298
commit 23a19572b2
2 changed files with 7 additions and 5 deletions
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3
lib/Analysis/Lint.cpp
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@ -583,7 +583,8 @@ Value *Lint::findValueImpl(Value *V, bool OffsetOk,
}
} else if (PHINode *PN = dyn_cast<PHINode>(V)) {
if (Value *W = PN->hasConstantValue())
return findValueImpl(W, OffsetOk, Visited);
if (W != V)
return findValueImpl(W, OffsetOk, Visited);
} else if (CastInst *CI = dyn_cast<CastInst>(V)) {
if (CI->isNoopCast(TD ? TD->getIntPtrType(V->getContext()) :
Type::getInt64Ty(V->getContext())))

9
lib/VMCore/BasicBlock.cpp
View File

@ -248,10 +248,11 @@ void BasicBlock::removePredecessor(BasicBlock *Pred,
// If all incoming values to the Phi are the same, we can replace the Phi
// with that value.
Value* PNV = 0;
if (!DontDeleteUselessPHIs && (PNV = PN->hasConstantValue())) {
PN->replaceAllUsesWith(PNV);
PN->eraseFromParent();
}
if (!DontDeleteUselessPHIs && (PNV = PN->hasConstantValue()))
if (PNV != PN) {
PN->replaceAllUsesWith(PNV);
PN->eraseFromParent();
}
}
}
}